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Mon, 28 Jun 2021 22:21:01 +0000 Received: from BYAPR12MB3479.namprd12.prod.outlook.com ([fe80::8dd5:b3:52b7:b353]) by BYAPR12MB3479.namprd12.prod.outlook.com ([fe80::8dd5:b3:52b7:b353%6]) with mapi id 15.20.4264.026; Mon, 28 Jun 2021 22:21:01 +0000 X-SNPS-Relay: synopsys.com From: Vineet Gupta To: Peter Zijlstra , Randy Dunlap CC: Mark Rutland , "linux-kernel@vger.kernel.org" , "will@kernel.org" , "boqun.feng@gmail.com" , "aou@eecs.berkeley.edu" , "arnd@arndb.de" , "bcain@codeaurora.org" , "benh@kernel.crashing.org" , "chris@zankel.net" , "dalias@libc.org" , "davem@davemloft.net" , "deanbo422@gmail.com" , "deller@gmx.de" , "geert@linux-m68k.org" , "gerg@linux-m68k.org" , "green.hu@gmail.com" , "guoren@kernel.org" , "ink@jurassic.park.msu.ru" , "James.Bottomley@hansenpartnership.com" , "jcmvbkbc@gmail.com" , "jonas@southpole.se" , "ley.foon.tan@intel.com" , "linux@armlinux.org.uk" , "mattst88@gmail.com" , "monstr@monstr.eu" , "mpe@ellerman.id.au" , "nickhu@andestech.com" , "palmerdabbelt@google.com" , "paulus@samba.org" , "paul.walmsley@sifive.com" , "rth@twiddle.net" , "shorne@gmail.com" , "stefan.kristiansson@saunalahti.fi" , "tsbogend@alpha.franken.de" , "ysato@users.sourceforge.jp" , arcml Subject: Re: [PATCH v2 00/33] locking/atomic: convert all architectures to ARCH_ATOMIC Thread-Topic: [PATCH v2 00/33] locking/atomic: convert all architectures to ARCH_ATOMIC Thread-Index: AQHXUW6ljftnBv7XLUWfOcoJEy64X6sE/CEAgBSegoCADv53gIABi12AgAAOa4CAAAIBgA== Date: Mon, 28 Jun 2021 22:21:01 +0000 Message-ID: References: <20210525140232.53872-1-mark.rutland@arm.com> <20210618084847.GA93984@C02TD0UTHF1T.local> <8a056e32-26bf-3038-984e-fcf8cac988d0@infradead.org> <4ec7308f-02c6-a357-eab8-63b6f2b7a5eb@infradead.org> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; 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Mon, 28 Jun 2021 22:21:01 +0000 Received: from BYAPR12MB3479.namprd12.prod.outlook.com ([fe80::8dd5:b3:52b7:b353]) by BYAPR12MB3479.namprd12.prod.outlook.com ([fe80::8dd5:b3:52b7:b353%6]) with mapi id 15.20.4264.026; Mon, 28 Jun 2021 22:21:01 +0000 X-SNPS-Relay: synopsys.com From: Vineet Gupta To: Peter Zijlstra , Randy Dunlap CC: Mark Rutland , "linux-kernel@vger.kernel.org" , "will@kernel.org" , "boqun.feng@gmail.com" , "aou@eecs.berkeley.edu" , "arnd@arndb.de" , "bcain@codeaurora.org" , "benh@kernel.crashing.org" , "chris@zankel.net" , "dalias@libc.org" , "davem@davemloft.net" , "deanbo422@gmail.com" , "deller@gmx.de" , "geert@linux-m68k.org" , "gerg@linux-m68k.org" , "green.hu@gmail.com" , "guoren@kernel.org" , "ink@jurassic.park.msu.ru" , "James.Bottomley@hansenpartnership.com" , "jcmvbkbc@gmail.com" , "jonas@southpole.se" , "ley.foon.tan@intel.com" , "linux@armlinux.org.uk" , "mattst88@gmail.com" , "monstr@monstr.eu" , "mpe@ellerman.id.au" , "nickhu@andestech.com" , "palmerdabbelt@google.com" , "paulus@samba.org" , "paul.walmsley@sifive.com" , "rth@twiddle.net" , "shorne@gmail.com" , "stefan.kristiansson@saunalahti.fi" , "tsbogend@alpha.franken.de" , "ysato@users.sourceforge.jp" , arcml Subject: Re: [PATCH v2 00/33] locking/atomic: convert all architectures to ARCH_ATOMIC Thread-Topic: [PATCH v2 00/33] locking/atomic: convert all architectures to ARCH_ATOMIC Thread-Index: AQHXUW6ljftnBv7XLUWfOcoJEy64X6sE/CEAgBSegoCADv53gIABi12AgAAOa4CAAAIBgA== Date: Mon, 28 Jun 2021 22:21:01 +0000 Message-ID: References: <20210525140232.53872-1-mark.rutland@arm.com> <20210618084847.GA93984@C02TD0UTHF1T.local> <8a056e32-26bf-3038-984e-fcf8cac988d0@infradead.org> <4ec7308f-02c6-a357-eab8-63b6f2b7a5eb@infradead.org> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org On 6/28/21 3:13 PM, Peter Zijlstra wrote: > On Mon, Jun 28, 2021 at 02:22:15PM -0700, Randy Dunlap wrote: >> However, something in arch/arc/ did look suspicious so I decided to >> try an ARC allmodconfig build, where I did see a few errors FYI: >> >> >> CC drivers/iommu/io-pgtable-arm.o >> In file included from ../include/linux/atomic.h:80, >> from ../drivers/iommu/io-pgtable-arm.c:12: >> ../drivers/iommu/io-pgtable-arm.c: In function 'arm_lpae_install_table': >> ../include/linux/atomic-arch-fallback.h:60:32: error: implicit declaration of function 'arch_cmpxchg64'; did you mean 'arch_cmpxchg'? [-Werror=implicit-function-declaration] >> 60 | #define arch_cmpxchg64_relaxed arch_cmpxchg64 >> | ^~~~~~~~~~~~~~ >> ../include/asm-generic/atomic-instrumented.h:1261:2: note: in expansion of macro 'arch_cmpxchg64_relaxed' >> 1261 | arch_cmpxchg64_relaxed(__ai_ptr, __VA_ARGS__); \ >> | ^~~~~~~~~~~~~~~~~~~~~~ >> ../drivers/iommu/io-pgtable-arm.c:320:8: note: in expansion of macro 'cmpxchg64_relaxed' >> 320 | old = cmpxchg64_relaxed(ptep, curr, new); >> | ^~~~~~~~~~~~~~~~~ > 0day also reported something like that. We found that this was a > pre-existing error, and Mark's patches only changed the error, it never > successfully build. > > cmpxchg64 is an optional feature for 32bit architectures, one that ARMv7 > does provide, and uses, for it's iommu bits. Building the ARM iommu > drivers on ARC seem somewhat daft but is a result of that COMPILE_TEST > config. Out of my ARC64 work, I have a boat-load of changes piled up in this area. Once Mark's changes hit mainline I can send those out for review and we can also consider adding cmpxchg64 for 32-bit ARC. -Vineet _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc